JP2001038622A - Pneumatic tool, and accessory therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working environment by surely collecting the dust generated during the cutting, grinding and polishing operations at a low cost. SOLUTION: The compressed air after rotating a rotor 12 is passed through a feed pipe 31, and ejected from a nozzle 29 inside a dust collective pipe 26. Since the pressure at side and the rear parts of the nozzle 29 is negative, the air containing the dust collected within a cover 25 flows into the dust collective pipe 26, and the dust is carried by the compressed air ejected from the nozzle and fed to a dust collective filter. In this configuration, a working part for grinding and a dust removing and sucking part are integrated with each other, the work can be achieved by a single person. In addition, the compressed air which is the drive source of rotation is recycled for sucking the dust, a compressor or the like for sucking and removing the dust can be dispensed with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tool for driving a cutter, a grinder, a drill, a hammer, or the like using compressed air as a power source, and an accessory used by being attached to such a pneumatic tool. For more details about the device,
The present invention relates to a compressed air tool having a dustproof function of removing dust generated during cutting, polishing, and the like, and an auxiliary device therefor.

[0002]

2. Description of the Related Art At construction sites and demolition sites,
Stone tools for rotating a rotor provided with vanes (wing bodies) using compressed air as a power source and rotating a disk-shaped cutter or a disk-shaped grinder with the rotation power are used. When working with such tools, a large amount of dust is generated due to cutting or cutting, etc., which not only obstructs the worker's view and makes the work difficult, but also improves health if the worker inhales the dust. High risk of harm.

[0003]

Therefore, conventionally, an air suction type dust remover equipped with a compressor and the like has been used together. However, at the time of such an operation, the work is performed by two people, for example, in the vicinity of an operator performing operations such as cutting and cutting, another operator holds the suction port of the hose close to the work site. Had to do. Further, since the dust is fine and dry, the dust quickly rises from the work site, and the efficiency of collection by the above-mentioned conventional method is not very good. Furthermore, in the above-mentioned method, in addition to a compressor for supplying compressed air, a compressor for dust removal must be prepared, and there is a problem that the cost of the apparatus becomes high.

[0004] The present invention has been made in view of the above points, and an object thereof is to provide a compressed air type tool and a compressed air type that can integrate a dust removing mechanism at relatively low cost. The goal is to get an accessory for the tool.

[0005]

Means for Solving the Problems and Embodiments of the Invention The first invention for solving the above-mentioned problems is a power conversion means for converting a flow of compressed air into a rotary motion or a reciprocating motion, and a power conversion device for rotating the power. A compressed air tool having an actuating body that performs work on an object in response to movement or reciprocation; a) a casing having a compressed air inlet and an outlet and containing the power conversion means; b) An operating body cover surrounding at least a part of the operating body; c) a dust pipe connected at one end to the operating body cover to discharge dust from near the operating body; d) a compressed air outlet of the casing. And an ejector tube having one end connected to the other end thereof and projecting toward the inside of the exhaust pipe and opening in a direction opposite to the operating body cover.

Here, the operating body can take various forms, but the operating body that responds to the rotational motion can be, for example, a disk-shaped cutter, a grinder, a drill, or the like, and responds to the reciprocating motion. The working body may be a hammer or the like. The shape of the operating body cover is appropriately changed according to the form of the operating body.

In the compressed air type tool according to the first aspect of the present invention, at the time of work, the power conversion means is driven by the flow of compressed air introduced into the casing from the compressed air inlet, and the compressed air passes through the ejector pipe through the compressed air outlet. Flow into Although the pressure of the compressed air is reduced by driving the power conversion means, it is higher than the atmospheric pressure. Therefore, when the compressed air that has passed through the ejector tube is vigorously injected into the inside of the exhaust pipe from the opening at the other end, the air flow causes a negative pressure at the side of the opening inside the exhaust pipe. When the operating body performs work on the object, dust is generated by cutting, cutting, polishing, piercing, and the like of the object. Since at least a part of the operating body is surrounded by the operating body cover, most of the dust collects inside the operating body cover. As described above, since the inside of the exhaust pipe is at a negative pressure, air containing dust flows in from the operating body cover side, and the dust is caught in the air ejected from the opening, and the dust is discharged together with the air. It is sent to the other end of the tube. Therefore, if a dust filter or the like is provided at the end of the exhaust pipe, the dust sucked up through the exhaust pipe can be collected.

The air flowing out of the compressed air outlet is
Since the power conversion has already been performed, the air pressure is considerably lower than before the power conversion. for that reason,
When the flow resistance is large, such as when the exhaust pipe is long,
In some cases, dust sucked from the inside of the operating body cover cannot be transported to the end of the exhaust pipe. In such a case, an auxiliary means for sucking air from the exhaust pipe may be provided.

A second aspect of the present invention for solving the above-mentioned problems has a power conversion means for converting a flow of compressed air into a rotary motion or a reciprocating motion, and a compressed air inlet and an outlet. An accessory device used by being attached to a compressed air type tool having a casing housing means, and an actuating body for performing a work on an object in response to the rotation or reciprocation; An operating body cover surrounding at least a part of the body; b) a dust pipe connected at one end to the operating body cover for discharging dust from the vicinity of the operating body; c) covering a compressed air outlet of the casing. An air outlet cover, and d) an ejector tube having one end connected to the air outlet cover and the other end protruding inside the exhaust pipe and opening in a direction opposite to the operating body cover. And

That is, the attachment device according to the second aspect of the present invention can achieve the same operation as that of the pneumatic compression type tool according to the first aspect of the invention by being retrofitted to a commercially available compressed air type tool. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A compressed air grinder for stone polishing according to one embodiment of the first and second inventions will be described below with reference to the drawings. The compressed air type grinder of the present embodiment is configured such that a special accessory (an adapter) is attached to a tool which is already commercially available to form the compressed air type tool of the present invention. FIG. 1 is a schematic cross-sectional view showing the structure of a compressed air grinder according to the present embodiment, FIG. 2 is an external perspective view of the compressed air grinder according to the present embodiment, and FIG. 3 is a mounting structure of an exhaust port cover of the compressed air grinder. FIG. 4 is a system configuration diagram when this compressed air grinder is used. FIG. 3 shows an arrow A in FIG.
FIG. 2 is an external view of the compressed air grinder in the direction of FIG.

As shown in FIG. 4, a system using a compressed air grinder according to the present embodiment includes a tool body 1, a compressor 2 for generating compressed air which is a power source of the tool body 1, and a tool for compressing the compressed air. A feeding tube 4 for feeding to the main body 1, a dust discharging tube 5 for sending out dust collected by the tool main body 1 as described later, and a dust collecting and blowing clean air to the outside. And a dust collection filter 3 for discharging.

The structure of the tool body 1 will be described with reference to FIGS. The casing 10 includes a grip portion 1 having a substantially cylindrical shape.
0a and a substantially cylindrical head portion 10b having an axis substantially perpendicular to the central axis of the grip portion 10a are integrally formed. A cylindrical chamber 11 is formed inside the grip portion 10a, and the rotor 12 is rotatably held by first and second bearings 15 and 16 through the cylindrical chamber 11 in the axial direction. The cylindrical chamber 1 is provided around the rotor 12.
A plurality of vanes 13 are attached very close to the inner peripheral wall of the first vane. The inside of one end (the left end in FIG. 1) of the rotor 12 is a hollow air flow passage 14 communicating with the cylindrical chamber 11, and compressed air supplied from the outside via the supply tube 4 is supplied to the casing. After being taken into the inside of the cylinder 10, it enters the cylindrical chamber 11 through the air flow passage 14. An air discharge passage 17 is formed in a part of the outer periphery of the cylindrical chamber 11, and the air discharge passage 17 communicates with an exhaust hole 18 provided on an outer wall of the casing 10.

A rotor gear 19 is attached to the other end of the rotor 12.
0 is engaged with a spindle gear 21 attached to the spindle gear 21. The spindle 20 has third and fourth bearings 22, 23.
, And a substantially disk-shaped grinder 24 is detachably provided at a lower end thereof.
A cover 25 surrounding the grinder 24 is mounted below the head 10b. In this embodiment, the cover 25
Consists of a metal upper surface portion 25a fixed to the head portion 10b and covering the upper surface of the grinder 24, and a flat cylindrical thick rubber surrounding portion 25b fixed to the upper surface portion 25a. Of course, the entire structure may be a metal integrated structure.

A cover 2 is provided on the upper surface 25a of the cover 25.
A dust collection tube 26 having an opening 27 communicating with the inside of the dust collection tube 5 is integrally formed, and a substantially L-shaped air injection tube 28 is provided so as to protrude inside from the side of the dust collection tube 26. I have. An opening end surface (hereinafter, referred to as “injection port”) 29 of the air injection pipe 28 opened inside the dust collection pipe 26 faces the opposite side to the cover 25, that is, the dust collection filter 3 side. An exhaust hole cover 30 is hermetically attached to the casing 10 at the exhaust hole 18, and the exhaust hole cover 30 and the air injection pipe 28 are provided.
Is connected to the outside opening of the air supply device by a flexible air supply pipe 31.

In a state where the exhaust hole cover 30 is removed from the casing 10, as shown in FIG.
Reference numeral 8 denotes an opening in front of a bulging portion 10c bulging to the side from the grip portion 10a of the casing 10. As shown in FIG. 3B, the exhaust hole cover 30 is fixed to the bulging portion 10c with two upper and lower screws 30b. An elastic body 30a such as rubber is provided around the contact surface of the exhaust hole cover 30 with the casing 10 so as to increase the adherence to the casing 10. The periphery may be sealed with a synthetic resin adhesive or the like. Of course, the exhaust hole cover 30 may be formed integrally with the casing 10.

The operation when using the compressed air grinder of this embodiment is as follows. When the compressor 2 is operated, compressed air is fed into the tool body 1 through the feeding tube 4. The air pressure at this time is, for example, 6 kg.
/ Cm ² . The compressed air enters the cylindrical chamber 11 through the air flow passage 14, hits the vanes 13 and
To rotate. Since the pressure of the compressed air is high, the rotor 12
Rotates at high speed. The compressed air that has hit the vane 13 flows from the air discharge passage 17 through the exhaust hole 18 to the air supply pipe 3.
It is sent to 1. When the rotor 12 rotates at a high speed, the spindle 2 is rotated via the rotor gear 19 and the spindle gear 21.
0 rotates at high speed. As a result, the grinder 24 rotates, and for example, the rough floor surface 6 can be polished.

The compressed air that has passed through the air supply pipe 31 is jetted from the injection port 29 of the air injection pipe 28 into the dust collection pipe 26.
The compressed air loses kinetic energy when rotating the vane 13, but still blows into the dust collection tube 26 while maintaining a pressure higher than the atmospheric pressure. Then, the side and the rear vicinity of the injection port 29 are in a negative pressure state in which the air pressure is lower than the atmospheric pressure. When the compressed air is ejected to the dust collection tube 26 having an inner diameter larger than that of the air supply tube 31 or the air injection tube 28, the air pressure is considerably reduced, but the inside of the dust discharge tube 5 is directed toward the dust collection filter 3. It flows. Grinder 2
Since the periphery of 4 is covered with cover 25, the dust generated by the contact between grinder 24 and floor 6 does not roll up around and is contained in the space surrounded by cover 25. As described above, since the pressure near the opening 27 of the dust collection tube 26 is negative, the air inside the cover 25 flows toward the negative pressure portion. Then, the surrounding portion 2 of the cover 25 is
Cover 2 from the outside through a gap between the lower end of 5b and the floor 6
5 Air flows inside. This air enters the dust collection tube 26 together with the dust collected inside the cover 25. Then, the dust is entrained in the airflow vigorously squirting from the injection port 29, and rides on the airflow to cause the dust discharge tube 5.
And then reach the dust filter 3.

In this compressed air grinder,
The dust generated by the polishing does not spread to the surroundings but is sucked by the dust discharging tube 5 and removed from the floor 6.

When the dust discharging tube 5 is relatively short, the dust can be conveyed to the dust collecting filter 3 by the air pressure of the compressed air ejected from the injection port 29. When 5 is long, dust may not be suctioned well. In such a case, a compressor may be provided at the inlet of the dust collection filter 3 to forcibly suck air.

In the tool body 1 of the above embodiment, the grinder 24 can be removed, and a disk-shaped cutter can be mounted on the spindle 20 instead, and used as a compressed air type cutter. FIG. 5 is a schematic sectional view showing a configuration of a main part of such a compressed air type cutter. FIG. 5 shows only parts different from FIG. Cutter 32 and spindle 20
And replace the cover with one that fits the shape. That is, the cutter cover 33 is
2 has an opening on the side surface so as to protrude, and has a structure in which the whole is closed except for the opening. Also in this compressed air type cutter, dust generated from the wall surface 7 by cutting is collected inside the cover 33 and sent from the dust collection tube 26 to the dust discharge tube 5.

Conventionally, commercially available compressed air tools are:
The compressed air after the rotation of the rotor 12 in the cylindrical chamber 11 is only discharged to the outside through, for example, an exhaust hole 18 as shown in FIG. For this reason, this exhaust not only contributes to raising dust, but also generates a very large noise. On the other hand, in the configuration in which the exhaust hole cover 30 is attached to the exhaust hole 18 and the compressed air after the rotor 12 is driven to rotate and flows through the air supply pipe 31 as in the present embodiment, the above noise is significantly reduced. FIG. 6 is a graph showing the measurement results regarding noise between the conventional product and this embodiment. FIG. 6A shows the measurement results in a small room having an area of about 100 m ² , FIG. 6B shows the measurement results in a large room without a partition wall, and FIG. 6C shows the measurement results outside the room. In each case, the sound pressure level of noise was measured using a noise measuring instrument, and the average value during continuous operation for 30 seconds was obtained. As is clear from FIG. 6, under any conditions,
A noise reduction effect of several dB to several tens dB, on average about 10 dB can be confirmed. Such reduction of noise is very effective in actual hearing, and the working environment can be significantly improved in terms of noise as well as dust as described above.

The above embodiment is merely an example, and it is apparent that changes and modifications can be made within the spirit of the present invention. For example, the above embodiment has a structure in which the axis of the rotor 12 driven by compressed air and the axis of the spindle 20 are substantially perpendicular to each other, but a straight line in which a grinder, a cutter, a drill, or the like is attached to the tip of the rotor itself. Obviously, the present invention can be applied to a tool of a shape. In addition to the rotating tools described above, some compressed air tools use reciprocating motion such as a pile driver and an excavator. The present invention can be applied to such a device for the purpose of effectively collecting dust generated from a work place.

[0024]

As described above, according to the compressed air type tool and the attached device for the compressed air type tool according to the first and second aspects of the present invention, the air flow after being used for driving the rotary motion or the reciprocating motion. Is used for suction for dust removal. Therefore, it is not necessary to separately provide an air suction unit such as a compressor for dust suction, and the cost of the entire apparatus can be reduced, and the installation space of the apparatus can be reduced. Also, since the compressed air tool and the dust suction device are integrated,
It is possible to minimize the scattering of dust to the surroundings and efficiently collect dust. Therefore, it contributes to maintenance of the worker's health without polluting the working environment. In addition, the worker can work efficiently alone. Further, compared to a case where the compressed air is directly discharged to the outside, the noise of blowing air can be significantly reduced. Accordingly, the vibration of the tool itself can be reduced.

Further, according to the accessory for a compressed air tool according to the second invention, the above effect can be obtained by attaching the accessory to a compressed air tool that has already been purchased by the user. Can be minimized.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a configuration of a compressed air grinder according to one embodiment of the first and second inventions.

FIG. 2 is an external perspective view of a compressed air grinder according to the embodiment.

FIG. 3 is an enlarged view showing a mounting structure of an exhaust port cover of the compressed air grinder according to the embodiment.

FIG. 4 is a system configuration diagram when the compressed air grinder is used.

FIG. 5 is a schematic sectional view showing a configuration of a main part of a compressed air cutter according to another embodiment of the first and second inventions.

FIG. 6 shows measurement data indicating the noise reduction effect according to the first and second aspects of the invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tool main body 2 ... Compressor 3 ... Dust collection filter 4 ... Feeding tube 5 ... Dust exhaust tube 10 ... Casing 10a ... Grip part 10b ... Head part 10c ... Swelling part 11 ... Cylindrical chamber 12 ... Rotor 13 ... Vane 14 ... air flow passages 15, 16, 2
2, 23 ... bearing 17 ... air discharge path 18 ... exhaust hole 19 ... rotor gear 20 ... spindle 21 ... spindle gear 24 ... grinder 25, 33 ... cover 25a ... upper surface part 25b ... surrounding part 26 ... dust collecting pipe 27 ... opening 28 ... Air injection pipe 29 ... Injection port 30 ... Exhaust hole cover 31 ... Air supply pipe 32 ... Cutter

Claims (2)

[Claims] 1. A pneumatic tool comprising: a power conversion means for converting a flow of compressed air into a rotary motion or a reciprocating motion; and an operating body for performing work on an object in response to the rotary motion or the reciprocating motion. Wherein a) a casing having a compressed air inlet and an outlet and containing the power conversion means, b) an operating body cover surrounding at least a part of the operating body, and c) one end connected to the operating body cover. A dust pipe for discharging dust from the vicinity of the working body; d) one end connected to a compressed air outlet of the casing, and the other end protruding inside the dust pipe, in a direction opposite to the working body cover. An ejector tube opened toward the compressed air tool. 2. A power conversion means for converting a flow of compressed air into a rotary motion or a reciprocating motion, a casing having a compressed air inlet and an outlet and housing the power conversion means, and responsive to the rotary motion or the reciprocating motion. An attached device used by being attached to a pneumatic tool having an operating member for performing work on an object, the device comprising: a) an operating member cover surrounding at least a part of the operating member; One end is connected to the operating body cover, a dust pipe for discharging dust from the vicinity of the operating body, c) an air outlet cover covering the compressed air outlet of the casing, and d) one end is connected to the air outlet cover. And an ejector tube having the other end protruding inside the exhaust pipe and opening in a direction opposite to the working body cover.